Registration Dossier
Registration Dossier
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EC number: 232-395-2 | CAS number: 8013-75-0 A combination of amyl alcohols, primarily isoamyl alcohol and 2-methyl-1-butanol. Other alcohols, acids, esters and aldehydes may also be present.
Vapour pressure
Administrative data
Link to relevant study record(s)
Description of key information
Fusel oil: <78.7 hPa at 20 -25 °C
Key value for chemical safety assessment
Additional information
The value for vapour pressure of fusel oil is based on a weight of evidence using experimental data for the substance itself and the main components of the substance (ethanol (CAS 64-17-5), 2 -methylpropan-1-ol (CAS-78-83-1), 3 -methylbutan-1-ol (CAS 123-51-3) and 2 -methylbutan-1-ol (CAS 137-32-6)).
The reported experimental vapour pressure of fusel oil is approximately 3 hPa at 20 °C. Reported experimental vapour pressures of ethanol range between 57.3 to 78.7 hPa for temperatures between 20°C-25°C, 133 hPa at 35°C and 533 hPa at 64°C. The reported experimental vapour pressure of 2 -methylpropan-1-ol range is < 16 Pa at 20 °C. The reported experimental vapour pressure of 3 -methylbutan-1-ol is approximately 3 hPa at 20 °C. Reported experimental vapour pressures of 2 -methylbutan-1-ol range between 2.7 to 4.3 hPa for temperatures between 20°C-25°C, and 7.9 hPa at 32°C.
According to the Raoult’s law, the vapour pressure of ideal mixture is equal to the mole-fraction-weighted sum of the components' vapour pressures and the vapour pressure of mixture should be lower than the vapour pressure of the component which has the highest vapour pressure in its pure form.
The highest reported vapour pressure (at 20-25 °C) was 78.7 hPa for pure ethanol. The lowest reported vapour pressure, approximately 3 hPa at 25 °C, was for the fusel oil substance and pure 3-methylbutan-1-ol.
As a conservative approach, the vapour pressure of the most volatile component (ethanol) is taken the vapour pressure of the fusel oil. Therefore, the vapour pressure value < 78.7 hPa at 20 -25 °C is taken as a key value for the chemical safety assessment of the substance.
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